If you mean " Analog input modules with order no. 6ES7 331-7NF00-0AB0 and product releases

E08, E09, E10 and E11 (delivered in period 05/05 to 09/05) can output incorrect measuring values for the duration of a module cycle at cyclic intervals of approx. 4 minutes.If one of your modules is affected by the problem, please speak to your SIMATIC contactat your local Siemens office about upgrading. "